SU1014120A1 - Device for single-channel synchronous phase control of multi-phase gate-type converter - Google Patents

Abstract

1i DEVICE FOR ONE-CHANNEL SYNCHRONOUS PHASE CONTROL OF MULTI-PHASE VENTILATING CONVERTER. Cc holding 1 clock generator, connected to the mains voltage, connected in series with phase shifting of the cell, input first. of which is connected to the output of the generator of synchronizing pulses, the distributor of pulses, made in the form of an annular cross-section circuit, the input of which is connected to the output of the last phase-shifting cell, which, in order to increase the reliability of the Converter in operation, is limited by the ATErtTfiO- .p. limiting valve opening angles for minimum and maximum, it is equipped with a pulse shaper limiting the minimum angle of opening and a pulse shaper limiting the maximum angle τ jerking, the clock inputs of which are connected to the output of the clock generator, and the control inputs are connected to the source

Description

signals of time intervals of anode voltages corresponding to the first anode voltage interval of this valve, the second input of the second element I is connected to the output of the same driver corresponding to the second anode voltage interval of this valve, the second input of the third and the first input of the fourth elements And are connected to the output the same driver corresponding to the third anode voltage interval of this valve.

2. The device according to claim 1, characterized in that, for the purpose of

simplifying, the first phase-shifting cell is designed as a reference voltage driver with a reset key, the control input of which is connected to the output of a synchronizing pulse generator, a comparator comparing the reference voltage with a control voltage, and the limiting pulse shapers are designed as comparators, the first inputs of which connected to the output of the driver of the reference voltage of the first phase-shifting cell, the sources of the voltage limit setting are connected to the second inputs.

This invention relates to electrical engineering, in particular to single-channel synchronous phase control of a multiphase valve converter.

A device for single-channel synchronous phase control of a multiphase valve converter is known.

radonizing pulses following with

11. interval: synchronous with the network

voltage, series-connected phase-shifting cells and a pulse distributor f 1.

The disadvantage of this device is the low reliability of operation of the converter due to the possibility of passing control pulses due to their displacement beyond the permitted range. ,

A device for controlling a static converter on controlled fans is known, which contains combinational logic circuits and memory elements,

The disadvantage of the device is a significant complication of the technical implementation, since in this case it is necessary to use a multichannel limiting impulse generator I

The closest in technical essence to the present invention is a device of single-channel synchronous control with a series connection of phase-shifting cells ZX

The drawback of the device is that the limitation of the minimum and maximum opening angles is performed by limiting the control voltage, which leads to partial loss of information during a short change in the control voltage beyond the permissible values, and consequently, to some additional decrease in speed, to the absence of one-to-one correspondence between the limitation of the instantaneous values of the control voltage and the average open angle value that is formed neither „

The purpose of the invention is to increase the reliability of the converter operation when controlled by a single-channel synchronous method with series-connected phase-shifting cells by limiting the maximum and minimum opening angles.

This goal is achieved by the fact that the control unit is equipped with pulse shapers limiting the minimum and maximum opening angles, the clock inputs of which are connected to the output of the generator of synchronizing pulses, and the control inputs are connected to the voltage sources for setting the limits. The shaper-logic signals of the time intervals of the anode voltages, the inputs of which are connected to the mains voltage source, 3. and an additional pulse distributor, consisting of identical gates according to the number of controlled gates, each of which contains four elements AND, the element OR The inputs of which are connected to the outputs of the elements AND, the driver of the output pulses, the input of which is connected to the output of the OR element, and the output is intended to be connected to the control electrode of the valve, the first inputs of the first, second the first and third elements I are connected to the valve output corresponding to this valve, the third input of the fourth element I is connected to the output of the valve corresponding to the previous, in turn, valve, the second input of the first element I connected to the output of the pulse shaper limiting the minimum yi-opening , the second input of the fourth element And is connected to the output of the pulse shaper limiting the maximum opening angle, the third input of the first element And is connected to the output of the shaper signal the anode voltage intervals corresponding to the first anode voltage interval of this valve, the second input of the second element And is connected to the output of the same driver, corresponding to the second anode voltage interval of this valve, the second input of the third and the first input of 4etBepToro elements And are connected to the output the same driver corresponding to the third anode voltage interval of this valve. Moreover, for the purpose of control, the first phase-shifting cell is made in the form of a reference voltage driver with a reset key, the control input of which is connected to the output of the clock generator, the comparator compares the reference voltage with a control voltage, and the limiting pulse formers are executed in In the form of comparators, the first inputs of which are connected to the output of the driver of the reference voltage of the first phase-shifting cell, sources for setting the constraint are connected to the second inputs. Nz FIG. Figure 1 shows a functional diagram of a control device using separate phase-shifting cells as formers of limiting pulse pulsers; in fig. 2 is the same as the control system node using the Reference voltage of the first phase-shifting cell for generating limiting pulses; in fig. 3 line diagrams explaining the operation of the device. The device contains a generator. 1 synchronizing pulses, shaper 2 logical signals of time intervals of anodic voltages, first, second and third phase-shifting cells 3-5 distributor 6 (ring counter-measuring device); shaper 7 pulses limiting the minimum opening angle J shaper 8 pulses limiting the maximum opening angle, additional distributor 9 pulses, cells 10-15 additional distributor impulse, fourth, third, second and first elements AND 16-19 cells of additional impulse distributor, element OR 20 cells additional pulse distributor, shaper 21 output control pulses of a chyka. The device works as follows. When pulses are received from the generator of synchronizing pulses At the inputs of the phase-shifting cell 3, the formers 7 and 8, the reference voltages are formed in the cell 3 of the constraints 7 and 8. These reference voltages are generated at the clock frequency, i.e. 6 f, where f f is the mains supply frequency. The reference voltages are compared, respectively, with the control voltage t), j, with the voltage setting of the minimum opening angle limiting and. „-“ and with the voltage setting of the maximum opening angle Sv. .rtx are the moments of equality of the reference voltages U., Hn-in and out of the cell 3, the formers 7 and 8 appear. At the output of cell 3, a narrow pulse appears, which is fed to the input of the second phase-shifting cell /. The processes of shaping the control pulses that are shifted along the base of the cell, and then the output of cell 5 are similar to those of the cell. ZB At the outputs of the formers 7 and 8, wide pulses are generated - from the moments of equality of the reference voltages of the INR voltage 1., - "and as soon as the next synchronizing pulse arrives at the inputs of the formers 7 and 8, and the low pulses from the outputs of the formers 7 and 8 arrive at the inputs additional distributor 9 pulses. The pulses from the last phase-shifting cell 5 are fed to the distributor 6, and at one of the outputs of the distributor a logical signal 1 appears, which remains until the next phase-shifted pulse arrives at the input. On the rest; Outputs at this time there is a logical signal O Suppose that the output of cell 5 to the input of the distributor 6 received a phase-shifted clock pulse of the cathode group A phase valve. In this case, the first output of the distributor 6 is the logical signal. This signal is supplied to the input first cells 10 of an additional distributor E corresponding to the same valve of the converter Shaper-2 logical signals at the actual intervals of the anodic voltage at any moment of time has a logical signal M only one and from six exits. The duration of the existence of a logical 1 at the output is the time interval between two consecutive And synchronization times, or, which is also, the interval between two adjacent points, if the converter gates are opened, since the moment it arrived. If rf-razorz 1 synchronizer is a low voltage pulse corresponding to the beginning of the working range of the phase A valve of the cathode group, signals from the second, first and sixth rammers of the imager 2 can be received on the inputs of cell 10, the signal from the second output corresponds to The first time interval of the anode voltage of the phase A valve of the cathode group has a duration of about 60 °. If the signal at the first output of the distributor b is set to this interval, then if there is still a signal from the output of the forcing 7, all the signals from Cm from the distributor b, the forming 2 and from the forming device 7 will be present at the input This is at the output of the element I 13 which, through turn, the Signal 06 of the element OR 20 enters the driver of the output control pulse 21, from the output of which the control pulse arrives at the control electrode of the phase A valve of the cathode group. If the signal at the first output of the distributor b is wits at the second time interval of the anode voltage of the same valve, then both signals will be present at the input of element 18 (signal from the first output of distributor 6 and the signal from the first output of the driver 2) and at the output of element 18 signal 1, which through elements 20 and 21 will ensure the formation of a pulse controlling the valve of the cathode group of phase A. If the signal at the first output of the distributor is in the third time interval of the anode voltage of the same valve, then The signal from element 17 will contain signals from the first output of the distributor 6 and from the sixth output of the former 2. At the output of element 17, a signal T appears which, through elements 20 and 21, opens the cathode group A phase valve. If in the third interval until the appearance signal from the output of the imaging unit 8 signal at the first output of the distributor 6 is not wilted, then at the output of the element And 1b a logical signal 1 is generated at the time of the signal from the output of the imaging device 8. In this case, the input of the element 16 will be present: the signal for limiting the maximum angle from the output of the imaging unit 8, the signal of the third time interval of the anode voltage from the output of the imaging device 2 and the signal on the previous distribution of the pulse from the sixth output of the distributor b. As in the previous cases, the signal from the output of element 1b through elements 20 and 21 is converted into a pulse control valve of the kzdod group of phase A. Similarly, the remaining cells 11-15 of the additional distributor 9 pulses are executed and work. Moreover, each of the signals at the output of the imaging unit 2 is used in three cells of the additional distributor: for one cell it is a signal of the second time interval, for the previous cell (in the order of valve operation) the signal of the third time interval, for the subsequent cell it is a signal of the first time interval. FIG. 2 denotes a clock pulse generator 1, a logic generator of anode voltage time intervals 2, a first 3, a second and a third 5 phase-shifting cells, comparators 7 and 8 of limiting pulse formation, cooTBetcTBeHHO, the minimum and maximum opening angles, the first 22fasor beam voltage reference generator 22, and a phase-shifter bar, and a phase-shifter bar. , the comparator 23 of the first phase-shifting cell, the reset key 2k of the reference voltage of the first phase-shifting cell. FIG. 2 inputs of the generator 1 synchronizing pulses and a driver 2 logic signals of the time intervals of the anode voltages are connected to the supply voltage. You run the generator 1 synchronizing pulses connected to the control input key 2k reset the reference voltage of the first phase-shifting cell 3. The input and output of the key 2k are connected to the inputs of the former 22 of the reference voltage of the first phase-shifting cell 3- Outlet of the former 22 of the reference voltage of the first phase shifter cells 3 are connected to the first inputs of the comparator 23 of the first phase-shifting cell 3, the minimum comparator 7 and the maximum limiter yi comparator 8. The second inlet compressor 23, 7 and 8 are respectively supplied with:; control voltage Uy, voltage setting the minimum limit and. opening angle and voltage setting of maximum opening yj. Further connections of the control unit elements are as described in FIG. 1. When a narrow pulse is received from the generator 1, their pulses are synchronized to the control input of the switch 2 4 for resetting the reference voltage of the first phase shifting cell 3, the switch 2k closes and the reference voltage of the driver 22 is reset. When the synchronizing pulse disappears, the switch 2k opens and goes the formation of the reference voltage by the shaper 22. The reference voltage from the output of the shaper 22 is supplied to the first inputs of the comparator 23 of the first phase-shifting cell 3 of the comparator 7 forming a minimization impulse pulse an open angle and a pulse shaping comparator 8 limiting the maximum opening angle. At comparators 23I 7 and 8, the reference voltage is compared, respectively, with the voltages U,, U. At moments of equality of the reference voltage, yrc4l ° R RU °, respectively, control pulses, limiting the maximum and minimum opening angles. Further operation of the control system is similar to that described in FIG. 1. Thus, the invention makes it possible to simplify the control system by using a single reference voltage simultaneously for the first phase-shifting cell, to form a pulse limiting the minimum opening angle and to generate a pulse limiting the maximum opening angle. FIG. 3 marked: Ud, U, UQ phase mains voltage; And synchronization pulses; U o-i is the reference voltage of the first phase-shifting cell and pulse shapers limiting the minimum and maximum opening angles; min- P control voltage; marrying, limiting the minimum opening angle; Uj, (- voltage setting the maximum opening angle limiting; UQ reference voltages of the second and third phase shifting 115 cells; AND - pulses at the output of the third phase shifter C7; Ir (, 5 pulses at the sixth and first outputs of the distributor; maximum opening angle; t-pulses oi ranimen / i, -, minimum opening angle; If., If., If, - the pulses on the second, first and sixth outputs of the logical time signal generator of the anode voltages corresponding to the first, second and third intervals The node voltage of the cathode group A phase A cathode; AND, the control pulses of the cathode A phase cathode. Line diagrams reflect three typical cases of the formation of control pulses of the cathode A phase A. The reference voltages refer to the formation of pulses from the reference voltages. controlling the valve of the suitable phase group A. The first output pulse Id is formed in the third section of the anode voltage under the action of limiting the maximum opening angle. A pulse is generated on the leading edge of the pulse. And since there is no pulse, but there is a pulse Lp of the previous operation of the distributor. If the first pulse in this segment (interval) was, then the output pulse would be formed on the leading edge Ir. | Absent) C

The second output impulse Id is formed in the second interval of the anode voltage of this, the valve when pulse K appears.,., Without the influence of the limiting pulses i., TnciA The third pulse I. is formed in the first interval of the anode voltage of this valve with limb

1p, 1. Had a front

and and „

and

pulses

RF

Ir appeared later

impulse ", then impulse Yd of fort impulse

would be on the leading edge of Mp.

The considered diagrams confirm the operability of the control device and the achievement of the set goal - improving the reliability of the converter operation by limiting the minimum and maximum opening angles. This goal is achieved by using single-channel pulse shaping systems for limiting the minimum and maximum opening angles with imposing limiting pulses using an additional combinational pulse distributor.

This device for single-channel synchronous phase control of a gate converter .-. Allows to increase the reliability of control of converters by simple means and without significant distortions in the working out of the control signal.

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Claims (2)

1i DEVICE FOR SINGLE-CHANNEL SYNCHRONOUS PHASE CONTROL OF A MULTI-PHASE VALVE CONVERTER, containing a synchronizing pulse generator, intended for connecting to the mains voltage, phaeo-shifting cells connected in series, the input of the first of which is connected to the output of the clock synchronization pulse generator, which is used as an alternating pulse circuit generator, which is connected to the output of the last phase-shifting cell, characterized in that, in order to increase the reliability of verters in · 'work by limiting the opening angle limiting valves for minimum and maximum, is provided with a pulse generator limits the minimum opening angle and the pulse generator limiting the maximum opening angle, clock inputs are connected to the output of the generator clock pulses, and control. the inputs are connected to voltage sources for setting constraints, by the * * generator of signals of time intervals of the anode voltages, the inputs of which are connected to the voltage source of the network, and an additional pulse distributor consisting of g identical cells in the number of controlled gates, each of which contains four And elements, OR element, the inputs of which are connected to the outputs of the AND elements, by the output pulse shaper, an input. which is connected to the output of the element 'OR, and the output is intended to be connected to the control electrode. the gate, the first inputs of the first, second and third elements And are connected to the output of the distributor corresponding to this valve, the third input of the fourth element And is connected to the output of the distributor corresponding to the previous order / operation, the valve, the second input of the first element And is connected to the output of the driver pulses to limit the minimum opening angle, the second input of the fourth element And is connected to the output of the pulse shaper to limit the maximum opening angle, the third input of the first element And is connected to Shaper output ПЫ1ЫПГ ^И> П <5 signals of time intervals of the anode voltages corresponding to the first interval of the anode voltage of a given valve, the second input of the second element And is connected to the output of the same driver corresponding to the second interval of the anode voltage of the valve, the second input of the third and the first input of the fourth elements And are connected with the output of the same driver corresponding to the third interval of the anode voltage of the valve. 2. The device according to π. 1, characterized in that, for the sake of simplicity, the first phase-shifting cell is made in the form of a reference voltage driver with a reset key, the control input of which is connected to the output of the generator. comparators, the first inputs of which are connected to the output of the driver of the reference voltage of the first phase-shifting cell, voltage sources for setting constraints are connected to the second inputs .